Introduction to Statistics and Data Analysis
5th Edition
ISBN: 9781305115347
Author: Roxy Peck; Chris Olsen; Jay L. Devore
Publisher: Brooks Cole
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Textbook Question
Chapter 2.1, Problem 6E
The article “Display of Health Risk Behaviors on MySpace by Adolescents” (Archives of Pediatrics and Adolescent Medicine [2009]: 27–34) described a study in which researchers looked at a random sample of 500 publicly accessible MySpace web profiles posted by 18-year-oids. The content of each profile was analyzed. One of the conclusions reported was that displaying sport or hobby involvement was associated with decreased references to risky behavior (sexual references or references to substance abuse or violence).
- a. Is the study described an observational study or an experiment?
- b. Is it reasonable to generalize the stated conclusion to all 18-year-olds with a publicly accessible MySpace web profile? What aspect of the study supports your answer?
- c. Not all MySpace users have a publicly accessible profile. Is it reasonable to generalize the stated conclusion to all 18-year-old MySpace users? Explain.
- d. Is it reasonable to generalize the stated conclusion to all MySpace users with a publicly accessible profile? Explain.
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4.46 Unemployment and relationship problems: A USA Today/Gallup poll conducted between 2010 and 2011 asked a group of unemployed and underemployed Americans if they have had major problems in their relationships with their spouse or another close family member as a result of not having a job (if unemployed) or not having a full-time job (if underemployed). 27% of the 1,145 unemployed respondents and 25% of the 675 underemployed respondents said they had major problems in relationships as a result of their employment status.(a) What are the hypotheses for evaluating if the proportions of unemployed and underemployed people who had relationship problems were different?
(. )Ho: punemployed = punderemployed
Ha: punemployed ≠ punderemployed
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(b) The p-value for this hypothesis…
The article "Display of Health Risk Behaviors on MySpace by Adolescents"+ described a study in which researchers looked at a random sample of 500 publicly accessible
MySpace web profiles posted by 18-year-olds. The content of each profile was analyzed. One of the conclusions reported was that displaying sport or hobby involvement was
associated with decreased references to risky behavior (sexual references or references to substance abuse or violence).
(a) Is the study described an observational study or an experiment?
an observational study
an experiment
(b) Is it reasonable to generalize the stated conclusion to all 18-year-olds with a publicly accessible MySpace web profile? What aspect of the study supports your answer?
No, it is not reasonable to generalize the stated conclusion since the study didn't include all 18-year-olds on MySpace.
No, it is not reasonable to generalize the stated conclusion since the study was an experiment and you cannot generalize conclusions to…
Raskauskas and Stoltz (2007) asked a group of 84 adolescents about their involvement in traditional and electronic bullying. The researchers defined electronic bullying as “…a means of bullying in which peers use electronics {such as text messages, emails, and defaming Web sites} to taunt, threaten, harass, and/or intimidate a peer” (p. 565). The table below is a frequency table showing the adolescents’ reported incidence of being victims or perpetrators or traditional and electronic bullying.
Using the table below as an example, explain the idea of a frequency table to a person who has never taken a course in statistics.
Explain the general meaning of the pattern of results.
Incidence of Traditional and Electronic Bullying and Victimization (N = 84)
Forms of bullying
N
%
Electronic victims
41
48.8
Text-message victim
27
32.1
Internet victim (websites, chatrooms)
13
15.5
Camera-phone victim
8
9.5
Traditional…
Chapter 2 Solutions
Introduction to Statistics and Data Analysis
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